| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.35 |
| Score | 0% | 67% |
Why is an insulator a poor conductor of electricity?
an insulator is made of organic material |
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an insulator is made of inorganic material |
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an insulator has many free electrons |
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an insulator has few free electrons |
Insulators have valence shells that are more than half full of electrons and, as such, are tightly bound to the nucleus and difficult to move from one atom to another.
What is the primary difference between a rectifier and an inverter?
a rectifier converts an AC input to DC while an inverter converts a DC input to AC |
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a rectifier strips out the AC portion of electricity while an inverter strips out the DC portion |
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a rectifier strips out the DC portion of electricity while an inverter strips out the AC portion |
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a rectifier converts a DC input to AC while an inverter converts an AC input to DC |
A diode allows current to pass easily in one direction and blocks current in the other direction. Diodes are commonly used for rectification which is the conversion of alternating current (AC) into direct current (DC). Because a diode only allows current flow in one direction, it will pass either the upper or lower half of AC waves (half-wave rectification) creating pulsating DC. Multiple diodes can be connected together to utilize both halves of the AC signal in full-wave rectification.
The sum of the voltage drops across each resistor in a __________ circuit will equal the total voltage applied to the circuit.
parallel |
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series |
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series-parallel |
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closed |
A series circuit has only one path for current to flow. In a series circuit, current (I) is the same throughout the circuit and is equal to the total voltage (V) applied to the circuit divided by the total resistance (R) of the loads in the circuit. The sum of the voltage drops across each resistor in the circuit will equal the total voltage applied to the circuit.
You would measure the amount of current through a circuit with a(n):
ammeter |
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potentiometer |
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voltmeter |
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battery |
Current is the rate of flow of electrons per unit time and is measured in amperes (A). An ammeter is used to measure the electric current in a circuit.
You would measure the amount of voltage between two points in a circuit with a(n):
reostat |
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battery |
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ammeter |
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voltmeter |
Voltage (V) is the electrical potential difference between two points. A voltmeter is used to measure the voltage between two points in a circuit.